package com.management.springboot.interceptor;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author scy
 * @Description
 * @date 2021/6/11-17:51
 */
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        Object user = session.getAttribute("user");
        if(user!=null){//检测用户是否登录，已登录交给相应的controller处理
            return true;
        }else{//未登录，返回到登录页
            request.setAttribute("msg","请登录");
            request.getRequestDispatcher("/").forward(request,response);

            return false;
        }

    }
    @Override
   public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }
    @Override
    public  void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }


}
